Mill and power mechanism



3 Sheets-Sheet 1.

(No Model.)

E. C. GRIFFIN. MILL AND POWER MEGHANISM.

Patented Mar. 31, 1891.

A TTR/VEYS fue mums Patins co., Fumo-mno., wAsmNcroN, o. c.

(No Model.) n s sheets-sheet s.

E. C. GRIFFIN. MILL AND PUWBR MBGHANISM. No. 449,118. Patented Mar. 31, 1891.

W/TNES'SES.' cuwwcwc. Q.

UNITED' STATESA PATENT rriCE.

EDWIN C. GRIFFIN, OF WEST NEWTON, MASSACHUSETTS.

MILL AND POWER MECHANlSlVi.

SPECIFICATION forming part of Letters Patent No. 449,118, dated March 31, 1891.

' Application filed October 29,1890. Serial No. 369,652. (No model.)

To all whom, it may concern;

Be it known that I, EDWIN O. GRIFFIN, a citizen of the Dominion of Canada, residing at West- Newton, in the county of Middlesex and State of Massachusetts, have invented certain new and useful ImprovementsinMills and Power Mechanisms; and I do hereby declare the following to be a full, clear, and eX-y act description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates generally to pulverizing -mil1s, and particularly to that class thereof in which the reduction or pulverization of ores and other substances is accom-` plished by the revolution of a roll or rolls within and against the inner surface of rings or annular dies, and in which said roll or rolls are held in contact with said rings or annular dies by centrifugal force when the mills are in operation; and it consists in the improvements in the construction, arrangement, and combination of parts disclosed in the following specification.

The objects of my invention are the production of a mill in which ores or other substances may be cheaply and rapidly crushed and pulverized or reduced to a powder; to effect the application of the power employed directly to the roll-shaft, whereby the roll will be caused to positively rotate against the annular die, gyrate around the inner surface of the same, and by its rotary momentum and centrifugal force crush and pulverize the material between the same and said die, and to provide a yielding or universal connection between the driving-power and the roll-shaft, whereby the roll will be positively revolved with its shaft on the same axle and gyrated within and against the inner surface of the annular die. These objects are accomplished by the mechanism illustrated in the accompanying drawings, forming part of this speciiication, in which the same reference numerals indicate the same or equivalent parts wherever found throughout the several views, and in which- Figure l represents a central vertical section of a mill provided with my improvement. Fig. 2 represents a top plan view of a portion of my improvement. Fig. 3 represents a horizontal section thereof on the line of Fig. l. Figs. 4 and 5 represent details of the construction employed therein. Figs. 6 and 7 represent central vertical sections of modified forms thereof, and Fig. 8 represents a central vertical section at right angles to that shown in Fig. 7.

This invention is an improvement on that for which Letters Patent of the United States were granted to James K. Griffin on August 20, 1889, No. 409,579, and relates particularly to the means for supporting and operating the grinding-roll and roll-shaft shown and described in said patent, all as hereinafter described.

Referring to the drawings, the referencenumeral 1 designates the casing of the grinding-chamber, and 2 the annular die located therein. This chamber and die, however, may be of any known or preferred construction and constitute no part of this invention, but are shown only for the purpose of illustrating the operation of the invention claimed herein, which consists of the means employed for supporting the roll-shaft 3 and grindingroll 4, attached to said shaft, and revolving the roll around the inner surface of the annular die 2.

The numeral 5 represents members of a supporting-frame, preferably of cast-iron, of any desired shape or form, and within the top of these standards are arranged bosses 6, which preferably rest upon inwardly-extending projections 7, formed upon the standards 5, and set-screws 8 are employed in connection with the standards for centering or adj usting the position of the bosses and maintaining them inthe desired position. Closely fitting within the bosses 6 is an annular support 9, to which is connected an annular extension 10, having an inwardlyextending iiange or rim l1, and connected with extension 10, preferably by a screw-thread, is the hollow conical or cylindrical stud l2, which serves as a support for the wheel or pulley 13 and its attachments. The upwardly-extending conical or cylindrical portion of this support also serves as a bearing or journal upon which the pulley 13 revolves. Many other devices may be employed for making this connection between the standards 5 and the conical support or bearing l2, and the parts 9 and 10 maybe formed integral, if preferred.

TOO

The wheel or pulley 13 is provided with a hub or journal-box 1l, which loosely fits and revolves upon the stud or journal 12. This hub 1-1 may be formed integral with the pulley 13, or fastened thereto by any suitable means. In the pulley 13, above the hub 14, is a circular opening 16, which is surrounded or inclosed by a casingorboxing 17, as shown in Fig. 2. Thehub la communicates with the central opening 10, the upper side of which is provided with an annular seat 1S, concave on its upper surface, and within or upon this seat rests the ball or sphere 19, firmly attached to the roll-shaft 3. The concave seat, upon which the ball 19 rests, extends slightly above the bottom of the chamber inclosed by the casing 17, and on opposite sides of the ball within the casing are formed recesses 20, having vertical plane side faces 2l, parallel to a vertical plane through the center of the pulley. In these recesses work cylindrical journals or trunnions formed on or firmly attached to the ball or sphere 19, and bet Ween the vertical surfaces of the recesses or boxes 20 and the journals or trunnions 22 on the driving 01 pressure side thereof, as the ease may be, and preferably loosely placed, are gibs 23, plain on the side adjoining the vertical surfaces of the recesses and cylindrieally concave on the other to iit the trunnions or journals 22. The casing 17 is provided with a cover 2l, the top of which contains achamber 25, into which oil or other lubricants are poured through openings provided for this purpose, from which they pass into the recesses or journal-boxes 2O and onto the ball 19 through passages 2G.

In Fig. 6 l have shown means for preventing the upward movement of the roll-shaft and roll, (a tendency to which exists in this class of mills,) consisting of a ring or cap 27, the lower surface of which fits upon the upper surface of the ball 19, held in place by a screw-bolt 2S, provided with a head 29 and nut 30, and in Figs. 7 and S a spiral spring 31 is inserted between the head of the bolt 2S and the ring or cap 27. This form of construction is preferable in some respects to that shown in Fig. G, in that it admits of greater ease of movement of the ball 19 and roll-shaft and produces less friction.

lVith the construction described, when the pulley 13 is revolved by a belt or otherwise, rotary motion is thereby imparted to the rollshaft and grinding or pulverizing roll 4; attached thereto, by means of the journals or trunnions 22, and it will be seen that the rollshaft supported by the ball 19 has perfect freedom of motion at all times to swing in any direction without impeding or interfering with its rotary motion, the device by Which the shaft is supported constituting a perfectuniversal joint.

lVhere the hub 1l and stud 12 are made conical, as described, the wear caused by friction may be taken up by means of the screw connection between the stud and its annular support 10, and if it is desired to obtain vertical adjustment of the roll-shaft and its attachment it may be had by means of the screw connecting the parts 9 and 10, and it is evident that the entire supportfor the roll-shaf t, including the pulley, may be adjusted laterally, leveled, and secured by the set-screws 8 and studs 6. It is also evident that atoothed wheel or pulley or a wheel driven by any dcvice other than a belt may be substituted for the pulley13 without departing from the principle of my invention; also, that the hub 14 may be made to iit and revolve within the hollow stud 12, instead of around it, as herein shown and described.

lf desired, the sha1' t 3 may be held by journal-bearing or otherwise in constant align ment at an angle to the axis of motion of the pulley by reason of the fact that the coupling forming the connection between the shaft and pulley constitutes a universal joint, and instead of the form of coupling or joint herein described any other form of universal coupling may be employed without departing from the scope of my invention, so far as it relates to the combined Wheel or pulley and roll-shaft connected by a universal coupling, whereby the rollshaft and roll attached thereto have perfect freedom to swing in any direction without impeding or interfering with its rotary motion, and whereby when the pulley is revolved the roll-shaft and roll are given a radial rotary movement and the rolls'haft and roll are gyrated around the central axis of the mill, the roll being held in contact with the annular die in the grindingchamber, when the mill is in operation, by centrifugal force, and falling away from said die, when the mill is not in operation, by gravity.

In operation the roll 4.- is rotated around the die 2 by means of a positive rot-ary power vapplied to the shaft, and is held in contact with or pressed against the die by centrifugal force.

The material to be pulverized is introduced Within the grinding-chamber by means of a spout 32, or in any other desired manner, and is taken up by the plows or stirrers 33, attached to the bottom of the roll, and is thrown against the annular die, where it is operated upon and crushed or ground by the roll a, and this operation is repeated until the material has been reduced to the required degree of neness, when it is discharged through the screen 34 into the annular chamber 35 between the screen and casing I, from which it passes into a receptacle or hopper 36 by means of passagesI 37,formed in the annular base of the mill, from which it is removed by a couveyer 3S. The operation of discharging the pulverized material through the screen is greatly facilitated by fans or vanos 39, attached to the roll-shaft immediately above the roll, in connection with the stirrers or plows 32, as they operate to cause a circulation of air through the mill and force the air,

IOC

ITO

together with the pulverized material, out through the screen into the chamber 34. The air is drawn into the mill in small quantities through the top thereof by the fans or vanes, which thus also operate to keep all dust or pnlverized material within the mill. This feature -of construction, however, constitutes no part of the invention claimed herein.

. It is evident that many changes may be made in the construction, combination, and arrangement of the various elements of the invent-ion described herein without departing from the scope thereof, and I do not limit myself to the exact form shown, and it is also evident that the power mechanism, consisting of the pulley, the roll-shaft, and means by which they are coupled or connected, which constitutes the main feature of my invention, is applicable to many uses other than that in connection with which it is here illustrated and described.

Having fully described my invention, its construction and operation, I claim, and desire to secure by Letters Patent, the following:

l. The combination, in a mill, of an annular die located in the grinding-chamber, a pulley supported horizontally above the grinding-chamber, and a roll-shaft and roll suspended from the pulley and directly con nected therewith by means of a universal coupling, whereby the roll-shaft and roll are at liberty to swing' in any direction, and when the pulley is revolved the roll is carried or rotated around the annular die and held in contact therewith by centrifugal force, substantially as shown and described.

2. In a pulverizing-mill, the combination of an annular die located in the pulverizingchamber, a pulley supported horizontally above the grinding-chamber, and a radiallymovable roller-shaft and roll suspended therefrom on a line with the axis thereof and directly connected therewith by a universal coupling, whereby when the pulley is revolved the roll is gyrated around the annular die and held in contact therewith by centrifugal force, substantially as shown and described.

3. In a pulverizing-mill, the combination, with an annular die, of a radially-movable rollshaft and roll, and a pulley from which the roll-shaft is suspended on a line with its axis, the pulley and roll-shaft being connected by a universal joint or coupling, substantially as shown and described.

4. In a pulverizing-inill, the combination of an annular die located in the pulverizingchamber, a pulley arranged horizontally above said grinding-chamber, provided with a central opening and recesses at the sides thereof, a radially movable rollshaft extending through said opening and provided with journals or trunnions adapted to enter said recesses, and a roll mounted on the roll-shaft, substantially as shown and described.

5. In a pulverizing-mill, the combination of an annular die-located in the pulverizingchamber, a pulley mounted horizontally above cesses, an annular ring or bearing on which the sphere rests and by which it is supported, and a roll mounted on the radially-movable shaft and adapted to travel around the annular die, substantially as shown and dcscribed.

6. In a mill, the combination, with the supports 5, of the hollow supporting stud or sleeve 12, connected with said supports 5, the pulley provided with the conical or cylindrical hub 14, revolubly mounted on said stud, and the roll-shaft suspended from the pulley by means of a universal coupling, substantially as shown and described.

7. The combination, in a pulverizing-mill, of the annular die located in the grindingchamber, the supports 5, the hollow support l2,adjustably connected with said support, the pulley revolubly mounted on said stud, and the roll-shaft and roll, the former ofwhich is suspended from said pulley on a line with its axis and connected therewith by a universal jointorcoupling,substantially as shown and described.

8. In a mill, the combination, with an annular die located in the grinding-chamber, of a pulley revolubly mounted above the grinding-chamber, and a radiallymovable rollshaft and roll suspended from said pulley on a line with its axis and connected directly therewith by a universal coupling, substantially as shown and described.

9. In a mill, the combination, with-an annular die, of a pulley revolubly mounted above the die, and a radially-movable rollshaft and roll suspended from said pulley and connected directly therewith by a universal coupling, the pulley being vertically adjustable on its supports, substantially as shown and described.

10. In a mill, the combination, with an annular die, of a pulley revolubly mounted above the die, and a roll-shaft and roll suspended from said pulley and connected therewith by a universal coupling, the pulley being laterally and vertically adjustable on its supports, substantially as shown and described.

11. The combination of the pulley I3, having the central opening 16 and journal-box casing 17, the recesses within which are provided with vertical side wa-lls forming journal-bearings, with the shaft 3, having the ball 19, provided with the journals 22, substantially as shown and described.

l2. The combination of the pulley 13, having the journal-box casing 17 and central opening, with the shaft 3 extending through said opening, provided with the ball 19 and trunnions or journals on opposite sides thereof, an annular concave seat on which said IIO ball rests, an annular ring or cap 27 resting upcn said ball, and means for holding the ring or cap in position, substantially as shown and described.

13. The combination of the pulley 13, having the journal-box casing 17 and central Opening, with the shaft 3 extending through said Opening, provided With the ball 19 and trunnions or journals on Opposite sides thereof, an annular concave seat on which said ball rests, an annular ring Or cap 27 resting on saidball, and means for exerting a yielding pressure on the cap or ring, substantially as shown and described.

1-1. The combination of the pulley 13, havingz` the central opening 16, and recesses 20, of the shaft 3, provided with the ball 19, and journals 22 and gibs 23, substantially as shown and described.

15. The combination of the pulley 13, having the recesses 20, with the shaft 3, provided with the ball 19, having the journals adapted to enter the recesses, a cap or ring 27, adapted to seat upon the ball, and means for holding it in contact therewith independent of the means by which the shaft and ball are supported, substantially as shown and described.

16. In a mill, the combination, with an annular die located in the grinding-chamber, of a pulley revolubly mounted above the grinding-chamber, a radially-movably rollshaft and roll suspended from said pulley and connected therewith by a universal coupling, and means for preventing the elevation or lifting of the roll-shaft when the mill is in operation, substantially as shown and described.

17. Ina mill, the combination of the annular die, the supports 5, the bosses 6, the annular rings or support-s 9 and 10, the stud or sleeve 12, and the pulley revolubly mounted On said stud and the roll shaft and roll connected with said pulley by a universal coupling, substantially as shown and described.

18. The combination, with the hollow stud 12, of the pulley 13, revolubly mounted thereon, and the radially-movable shaft 3, connected With said pulley by a universal coupling, substantially as shown and described.

EDWIN C. GRIFFIN.

Witnesses:

WM. D. GRIER, JOSEPH COOK. 

